Road drilling tool for setting marking plugs and the like



Sept. 11, 1934- L. L. RICHARDSON 1,973,176

ROAD DRILLING TOOL FOR SETTING MARKING PLUGS AND THE IZIKE Filed Aug.29, 1930 2 Sheets-Sheet 1 f0 4. E/Cl/Affl K/ INVENTOR ATTORNEY p 1934-L. RICHARDSON 1,973,176

ROAD DRILLING TOOL FOR SETTING MARKING PLUGS AND THE LIKE Filed Aug. 29,19:50 '2 sheets-sheet 2 ATTORNEY Patented Sept. 11, 1934 UNITED STATESPATENT OFFICE ROAD DRILLING TOOL FOR S E T T I N G MARKING PLUGS AND THELIKE Application August 29,

2 Claims.

This invention relates to a road drilling tool for setting marking plugsand the like in pavements, the tool being particularly adaptable for usewith drilling machines of the percussion or hammer type to effect thesetting operation.

It has been customary in the past to set metal discs in the pavementmanually, namely, by first drilling an aperture therein, setting thedisc in such aperture and completing the operation by hand. In caseswhere it was necessary to lay out lengthy traific lanes the amount ofwork accomplished per day was relatively small and the cost, therefore,relatively high.

One of the objects of my invention is to provide a tool attachment for afluid operated hammer which will facilitate the drilling of apertures inpavements for the reception of metal discs.

Another object of my invention is to provide a tool attachment for afluid operated hammer which will facilitate securing metal discs intheapertures so formed.

Further objects will be apparent from the following detailed descriptionwherein similar characters of reference designate corresponding partsand wherein:

Fig. 1 is an elevation of a fluid operated hammer showing in section thepreferred embodiment of drilling tool attached thereto.

Fig. 2 is a perspective view of a drilling tool which is preferably usedfor making apertures in the pavement for the reception of metal discs.

Fig. 3 is an elevation of a fluid operated hammer showing in section thepreferred embodiment of driving tool attached thereto.

Fig. 4 is a perspective view of a tool which is preferably used fordriving a disc into the apertures formed in the pavement.

Fig. 5 is a perspective view of a metal disc, such as is usually fixedin the pavement for outlining trafiic lanes.

With reference to the drawings I have illustrated in Fig. 1 acompression hammer comprising a cylinder 10 in which there isreciprocally mounted a ram 11 which impells with percussive force thecoaxially aligned drilling tool 12. V

The tool or drilling attachment embodies a frusto-conical body portion13, Figure 2, having a substantially concave base 14. Formed integrallywith the body portion and the periphery of the base is an annular knifeedge 15. The body portion is drilled centrally as at 16 and of suchcomplementary configuration at 17 as to receive the outermost end of theram 11 and at 18 to receive one end of the drill point 19.

1930, Serial No. 478,759

With reference to Figs. 3 and 5 I have shown in Fig. 5 a metal discwhich is used in outlining traflic lanes as comprising a casting 21having a cylindrical pronged member 22 formed integrally therewith andprojecting downwardly from the under side thereof. The disc is adaptedto have a metal cap 23, enclosing the face thereof and adapted to beaflixed thereto by turning the peripheral edge thereof under as at 24.

The tool or driving attachment which I preferably use for positioningthe disc in a planular surface such as a pavement embodies afrusto-conical body portion 25 and a concave base 26 of complementalconfiguration with the cap 23 of the disc 21. The body portion has acentrally drilled aperture 27 therein which is adapted to receive theouter end of the ram 11 of a pneumatic hammer.

As is shown in Fig. 1 in using the tool the drill point 19 is adapted toform a cylindrical aperture 19' in the pavement, and at the same timethe knife edge 15 is forming the concentric groove 20. Referring to Fig.3 and in accordance with practice a wooden block 28 is placed in theaperture 19' and the pronged extension of the disc is placed above it,as shown.

The driving tool is placed on the face of the disc and pressure exertedthereon, thus driving the disc securely into place, by driving thepronged member into the block 28 and the edge 24 into engagement withthe groove 20.

It will be seen from the above detailed description that I have provideda method and apparatus for setting metal discs in pavements and the likewhich in addition to preventing defacing and injuring the cap willeffectuate the operation in a more expeditious manner.

Although the foregoing description is necessarily of a detailedcharacter in order to completely set forth this invention, it is to beunderstood that the speciflc terminology is not intended to berestrictive or confining and it is to be further understood that variousrearrangements of parts and modifications of structural details may beresorted to without departing from the scope or spirit of the inventionas herein claimed.

.1 claim:

1. A drilling tool for use in forming fastening openings in roads formarking plugs comprising a substantially cylindrical body having asubstantially fiat bottom surface, a circular cutting flange formedintegral with the body and extending downwardly from the flat bottomsurface, said cutting flange having approximately the same cutting angleon both its radially inner and radially outer surfaces, said bodyportion being formed with an axial bore having walls tapering from thetop of the body and the bottom surface of the body inwardly to thecenter of the body, a tapered pilot bit removably fitting in the bottomof the axial bore and a ram removably fitting into the top of said bore.

2. A drilling tool for setting marking plugs and the like in a road orpavement compris-

